A diagnostic device and method for a cigarette detection system of a high-speed packaging machine

Abstract

A diagnostic device and method for a high-speed packaging machine cigarette detection system, device: a controller is respectively connected to a computer, a digital input module, an analog input module, a digital output module and a 725 small box packaging machine; the digital input module is respectively connected to the mold box chain origin sensor, contact sensor 1 and contact sensor 2; the analog input module is respectively connected to the filter tip end sensor, the tobacco end sensor and the main encoder of the 725 small box packaging machine; the digital output module is connected to the driving cylinder of contact sensor 1 and the driving cylinder of contact sensor 2 through an electromagnetic reversing valve. Method: the wear of the rubber roller is detected by the contact sensor; the filter tip end sensor and the tobacco end sensor are used to collect whether there are empty or missing cigarettes in the cigarette group under the current operating state; the abnormal operating parameters are analyzed and corrected; and the diagnostic process is exited. The device and method can quickly and effectively diagnose the cause of the empty or missing cigarette rejection.

Description

Technical Field

[0001] The invention belongs to the technical field of cigarette equipment, and in particular relates to a diagnostic device and method for a cigarette detection system of a high-speed packaging machine. Background Art

[0002] The function of the FOCKE 725 small box packaging machine is to complete the cigarette forming and trademark paper packaging process of the FXS unit. The empty / missing detection system is operated based on the acquisition and processing of the photoelectric detector signal. The empty / missing detector has three photoelectric sensors at the filter end and the tobacco end, corresponding to the upper, middle and lower layers of the cigarette group. When the equipment is running, it scans the 52 mold boxes and the cigarette groups on the mold box chain one by one, and uses the three photoelectric sensors at the filter end to find the mold box edges and the cigarette group edges. Then, a series of internal calculations are performed based on the set parameters to determine whether there are missing cigarettes in the cigarette group or whether there are empty cigarettes at the tobacco end of the cigarette, and then remove them in the subsequent process. However, there are many reasons for rejection. The empty end has tobacco filling degree, cigarette group integrity, etc., and the filter end has cigarette group integrity, filter length, cigarette group stability and low output signal, etc. In addition, there are two supporting rollers on both sides of each mold box on the mold box chain. The surface of the rollers is made of rubber. Long-term operation will cause a certain degree of wear, causing the mold box chain to run unsteadily, thereby affecting the accuracy of the detection signal and easily causing false rejection. Moreover, the original control system of 725 can only see that a certain reason caused the rejection, but does not provide the specific position of the rejected cigarette in the cigarette group, which cannot provide accurate instructions for subsequent maintenance, nor can it determine the real reason for the rejection. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a diagnostic device for a cigarette detection system of a high-speed packaging machine, which can quickly and effectively diagnose the cause of the empty or missing cigarette rejection failure; the method has simple steps and can achieve rapid and accurate detection of the cigarette group mistaken rejection failure without affecting the various functions of the original equipment.

[0004] The present invention provides a diagnostic device for a cigarette detection system of a high-speed packaging machine, comprising a controller, a computer, a digital quantity input module, an analog quantity input module, a digital quantity output module, a contact sensor 1, a contact sensor 2, a mold box chain origin sensor, a filter tip end sensor, a tobacco end sensor and a main encoder;

[0005] The contact sensor 1 and the contact sensor 2 are both cylinder-type digital sensors, and are symmetrically installed on both sides of the mold box chain, and are respectively located below the two supporting rollers on both sides of each mold box; the contact sensor 1 and the contact sensor 2 are respectively used to detect the wear degree of the two corresponding supporting rollers by contact;

[0006] The mold box chain origin sensor is installed below the mold box chain and is used to detect the position of each mold box in the mold box chain;

[0007] The filter tip sensors are three photoelectric sensors A, which are installed on the filter tip side of the cigarette group on the mold box chain and correspond to the upper, middle and lower layers of cigarettes in the cigarette group respectively, wherein the detection light of each photoelectric sensor A is irradiated on the end of the filter tip of each layer of cigarettes;

[0008] The tobacco end sensors are three photoelectric sensors B, which are installed on the side of the tobacco end of the cigarette group on the mold box chain and correspond to the upper, middle and lower layers of cigarettes in the cigarette group respectively, wherein the detection light of each photoelectric sensor A is irradiated on the end of the tobacco end of each layer of cigarettes;

[0009] The controller is respectively connected with a computer, a digital quantity input module, an analog quantity input module, a digital quantity output module and a 725 small box packaging machine;

[0010] The digital quantity input module is respectively connected to the mold box chain origin sensor, the contact sensor 1 and the contact sensor 2;

[0011] The analog input module is respectively connected to the filter tip end sensor, the tobacco end sensor and the main encoder of the 725 small box packaging machine;

[0012] The digital quantity output module is connected with the driving cylinder of the contact sensor 1 and the driving cylinder of the contact sensor 2 through the electromagnetic reversing valve.

[0013] As a preference, the controller is a PLC controller.

[0014] Preferably, the solenoid reversing valve is a two-position three-way solenoid reversing valve. When it works in the left position, the air path between its P port and A port is connected, and its T port is blocked. When it works in the right position, its P port is blocked, and the air path between its T port and A port is connected. The P port of the solenoid reversing valve is connected to the high-pressure air source through a pipeline.

[0015] In the present invention, by adding the settings of contact sensor 1 and contact sensor 2, the rubber rollers on both sides of the mold box chain can be conveniently detected, so that the displacement signal fed back by the contact sensor can be used to determine whether the rubber rollers on both sides are worn; by setting the filter end sensor and the tobacco end sensor, it is convenient to collect whether there are empty or missing cigarettes in the cigarette group under the current operating state; by setting the mold box chain origin sensor, the position signal of each mold box can be detected; by connecting the main encoder of the 725 small box packaging machine, the main coding signal can be conveniently obtained; in this way, the position of the worn rubber roller and the specific position of the empty or missing cigarettes in the cigarette group can be conveniently determined by the mold box position signal and the main coding signal. The diagnostic device has a simple structure and can help to quickly determine the cause of the erroneous rejection of cigarettes, effectively solving the problems of time-consuming troubleshooting and low maintenance efficiency.

[0016] The present invention also provides a diagnostic method for a cigarette detection system of a high-speed packaging machine, comprising the following steps:

[0017] Step 1: Control the start of the 725 small box packaging machine through the PLC controller;

[0018] Step 2: Check whether there is any false rejection during the operation of the 725 small box packaging machine. If there is no false rejection, keep the 725 small box packaging machine running normally. If there is a false rejection, execute step 3;

[0019] Step 3: Perform the first level diagnosis; control the running speed of the 725 small box packaging machine to be reduced to 100 packs / minute, and send a drive signal A to the digital output module. After receiving the drive signal A, the digital output module simultaneously controls the drive cylinders of the contact sensor 1 and the contact sensor 2 to move, so that the probes of the contact sensor 1 and the contact sensor 2 are both raised to the set height and respectively close to the rubber rollers on both sides of the mold box. The mold box chain rotates three times as a diagnosis cycle. The wear of the rubber roller is determined based on the displacement signals fed back by the contact sensor 1 and the contact sensor 2. If there is no wear, directly execute step 4;

[0020] If there is wear, the controller combines the position signal of each mold box detected by the mold box chain origin sensor and the main coding signal of the 725 small box packaging machine detected by the main encoder to determine the specific position of the worn rubber roller on the mold box chain, so that maintenance personnel can quickly replace it; after detecting that the worn rubber rollers have been replaced, the digital output module sends a drive signal B, and after receiving the drive signal B, the digital output module simultaneously controls the drive cylinders of the contact sensor 1 and the contact sensor 2 to move, so that the probes of the contact sensor 1 and the contact sensor 2 are both raised to the set height and respectively close to the rubber rollers on both sides of the mold box, and executes step 4;

[0021] Step 4: Perform the second level diagnosis; the controller uses the filter end sensor and the tobacco end sensor to collect information about whether there are any empty or missing cigarettes in the cigarette group under the current operating state, and combines the position signal of each mold box detected by the mold box chain origin sensor and the main coding signal of the 725 small box packaging machine detected by the main encoder to determine the specific position of the empty or missing cigarettes in the cigarette group, and adjust the rejection operation parameters of the corresponding cigarette layer according to the specific position of the empty or missing cigarettes in the cigarette group; if the erroneous rejection phenomenon disappears, the fault is eliminated, and after saving the current parameters, the diagnosis process ends and step 6 is executed; if the erroneous rejection phenomenon still exists, step 5 is executed;

[0022] Step 5: Perform the third-level diagnosis; extract the core operation parameters and analyze the parameter changes, identify the abnormal parameters that cause the false rejection and make corrections, and observe whether the equipment can operate normally. If the false rejection phenomenon is eliminated, save the current parameters, end the diagnosis process, and execute step 6; if the false rejection phenomenon still exists, repeat the observation and correction of the abnormal parameters until the parameters are adjusted to a reasonable range to eliminate the false rejection phenomenon;

[0023] Step 6: Save the current operation parameters and exit the diagnostic system.

[0024] Furthermore, in order to facilitate real-time observation, in step 4, the control is used to display the specific positions of the empty or missing cigarettes in the cigarette group in real time through the display screen connected thereto.

[0025] The method has simple steps and can efficiently and accurately detect the cause of erroneous rejection of cigarettes through an online detection method, effectively reducing the maintenance time and difficulty; at the same time, it can achieve accurate positioning of defective cigarettes and targeted troubleshooting through graded diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a circuit principle block diagram of the diagnostic device in the present invention;

[0027] Figure 2 It is a schematic diagram of the assembly of the contact sensor in the present invention;

[0028] Figure 3 It is a schematic diagram of the cooperation between the contact sensor and the rubber roller in the present invention;

[0029] Figure 4 is a schematic diagram of the contact sensor in the present invention in a detection state;

[0030] Figure 5 is a schematic diagram of the contact sensor in the present invention being in a non-detection state;

[0031] Figure 6 Schematic diagram of the diagnostic method of the present invention.

[0032] In the figure: 1. mold box chain, 2. mold box chain origin sensor, 3. contact sensor 1, 4. contact sensor 2, 5. electromagnetic reversing valve, 6. rubber roller, 7. filter end sensor, 8. tobacco end sensor. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] like Figures 1 to 6 As shown, a diagnostic device for a cigarette detection system of a high-speed packaging machine includes a controller, a computer, a digital input module, an analog input module, a digital output module, a contact sensor 1 3, a contact sensor 2 4, a mold box chain origin sensor 2, a filter tip end sensor 7, a tobacco end sensor 8 and a main encoder;

[0035] The contact sensor 1 3 and the contact sensor 2 4 are both cylinder-type digital sensors, and are symmetrically installed on both sides of the mold box chain 1, and are respectively located under the two supporting rollers on both sides of each mold box; the contact sensor 1 3 and the contact sensor 2 4 are respectively used to detect the wear degree of the two corresponding supporting rollers by contact;

[0036] The mold box chain origin sensor 2 is installed below the mold box chain 1 and is used to detect the position of each mold box in the mold box chain 1;

[0037] The filter tip sensor 7 is three photoelectric sensors A, which are installed on the filter tip side of the cigarette group on the mold box chain 1 and correspond to the upper, middle and lower layers of cigarettes in the cigarette group respectively, wherein the detection light of each photoelectric sensor A is irradiated on the end of the filter tip of each layer of cigarettes;

[0038] The tobacco end sensor 8 is three photoelectric sensors B, which are installed on the tobacco end side of the cigarette group on the mold box chain 1 and correspond to the upper, middle and lower layers of cigarettes in the cigarette group respectively, wherein the detection light of each photoelectric sensor A is irradiated on the end of the tobacco end of each layer of cigarettes;

[0039] The controller is respectively connected with a computer, a digital quantity input module, an analog quantity input module, a digital quantity output module and a 725 small box packaging machine;

[0040] The digital quantity input module is respectively connected to the mold box chain origin sensor 2, the contact sensor 1 3 and the contact sensor 2 4;

[0041] The analog input module is respectively connected to the filter tip end sensor 7, the tobacco end sensor 8 and the main encoder of the 725 small box packaging machine;

[0042] The digital output module is connected to the driving cylinder of the contact sensor 1 3 and the driving cylinder of the contact sensor 2 4 through the electromagnetic reversing valve 5. In the preferred embodiment, the electromagnetic reversing valve 5 is a two-position three-way electromagnetic reversing valve. When it works in the left position, the air path between its P port and A port is connected, and its T port is cut off. When it works in the right position, its P port is cut off, and the air path between its T port and A port is connected. The P port of the electromagnetic reversing valve 5 is connected to the high-pressure gas source through a pipeline.

[0043] As a preference, the controller is a PLC controller.

[0044] As a preferred embodiment, it also includes a human-machine interactive touch control screen, which is connected to the controller, and is provided with a visual interface and control buttons, the visual interface is used to display the diagnostic process parameters in real time according to the control of the controller, and the control button is used to send a primary diagnostic control signal to the controller, exit the primary diagnostic control signal, a secondary diagnostic control signal, exit the secondary diagnostic control signal, a tertiary diagnostic control signal, and exit the tertiary diagnostic control signal;

[0045] After receiving the first-level diagnostic control signal, the controller controls the running speed of the FOCKE 725 small box packaging machine to be reduced to 100 packs / minute. At the same time, the solenoid reversing valve 5 is controlled to work in the left position through the digital output module to connect the high-pressure air source to the rodless chamber of the driving cylinder of the contact sensor 3 and the rodless chamber of the driving cylinder of the contact sensor 2 4, so that the probe of the contact sensor 3 and the probe of the contact sensor 2 4 rise to the set height; the contact sensors 1 3 and 2 feed back their respective displacement change signals to the controller during the contact process with the rubber rollers 6 on both sides of the mold box chain 1. The controller determines whether the rubber rollers 6 on both sides are worn according to the displacement change signals, and combines the mold box The position signal of each mold box detected by the chain 1 origin sensor and the main coding signal of the 725 small box packaging machine detected by the main encoder determine the specific position of the worn rubber roller 6 on the mold box chain 1; after the controller receives the control signal to exit the first-level diagnosis, it controls the electromagnetic reversing valve 5 to work in the right position through the digital output module to connect the rodless cavity of the driving cylinder of the contact sensor 1 3 and the rodless cavity of the driving cylinder of the contact sensor 2 4 to the atmosphere. After the rodless cavity of the driving cylinder of the contact sensor is connected to the atmosphere, under the action of the reset spring inside the driving cylinder, the probe moves downward and resets to a state away from the rubber roller 6;

[0046] The controller receives the secondary diagnosis control signal, and collects whether there are any empty or missing cigarettes in the cigarette group under the current operating state through the filter end sensor 7 and the tobacco end sensor 8. The filter end sensor 7 and the tobacco end sensor 8 determine whether there are empty or missing cigarettes through the reflected light signal, and determine the specific position of the empty or missing cigarettes in the cigarette group in combination with the position signal of each mold box detected by the mold box chain origin sensor and the main coding signal of the 725 small box packaging machine detected by the main encoder; at the same time, the corresponding cigarette layer parameters are adjusted according to the specific position of the empty or missing cigarettes to avoid the phenomenon of mistaken rejection. After the mistaken rejection phenomenon is eliminated, the current parameters are saved; after receiving the exit secondary diagnosis control signal, the controller stops collecting whether there are any empty or missing cigarettes in the cigarette group under the current operating state through the filter end sensor 7 and the tobacco end sensor 8;

[0047] After receiving the third-level diagnostic control signal, the controller analyzes the operating parameters of the rejection mechanism, finds out the abnormal parameters that are beyond the set range, and corrects the abnormal parameters. If the false rejection phenomenon disappears, the current operating parameters are saved and the diagnostic process ends. If the false rejection phenomenon still occurs, the abnormal parameters are repeatedly analyzed and corrected until the parameters are adjusted to a reasonable range and the false rejection phenomenon is eliminated. After receiving the exit third-level diagnostic control signal, the controller stops analyzing and correcting abnormal parameters.

[0048] The device has a simple structure, is safe and reliable, and can realize online viewing of the detection status of each cigarette in the cigarette group without stopping the machine or affecting the control functions of the original packaging machine. It can also accurately locate the cigarettes that cause empty / missing cigarettes to be mistakenly rejected, effectively solving the problems of time-consuming fault handling and low maintenance efficiency. It is reliable, has a fast processing speed, and is easy to promote. The device can be used for FOCKE 725 empty / missing cigarette detection to accurately locate defective cigarettes, effectively reducing the maintenance time and difficulty.

[0049] In the prior art, the main reasons for the rejection of empty / missing cigarette groups by the FOCKE 725 small box packaging machine are as follows: (1) There are empty cigarettes themselves; (2) Improper adjustment of the cigarette warehouse or hardware damage, resulting in missing cigarette groups; (3) The mold box chain is not running smoothly, causing abnormal detector signals and causing erroneous rejection; (4) Improper parameter settings cause deviations in calculation results and cause erroneous rejection. Therefore, the reasons for the rejection of the 725 equipment are complex and diverse, but the existing diagnostic devices cannot provide accurate fault and maintenance help information, resulting in a time-consuming and difficult maintenance process.

[0050] To this end, the present invention also provides a diagnostic method for a cigarette detection system of a high-speed packaging machine, comprising the following steps:

[0051] Step 1: Control the start of the 725 small box packaging machine through the PLC controller;

[0052] Step 2: Check whether there is any false rejection during the operation of the 725 small box packaging machine. If there is no false rejection, keep the 725 small box packaging machine running normally. If there is a false rejection, execute step 3;

[0053] Step 3: Perform the first level diagnosis; control the running speed of the 725 small box packaging machine to be reduced to 100 packs / minute, and send a drive signal A to the digital output module. After receiving the drive signal A, the digital output module simultaneously controls the driving cylinders of the contact sensor 1 and the contact sensor 2 4 to move, so that the probes of the contact sensor 1 and the contact sensor 2 4 are both raised to the set height, and are respectively close to the rubber rollers 6 on both sides of the mold box, and the mold box chain 1 rotates three times as a diagnosis cycle, and the wear of the rubber roller 6 is determined according to the displacement signals fed back by the contact sensor 1 and the contact sensor 2 4. If there is no wear, directly execute step 4;

[0054] If there is wear, the controller combines the position signal of each mold box detected by the mold box chain origin sensor 2 and the main coding signal of the 725 small box packaging machine detected by the main encoder to determine the specific position of the worn rubber roller 6 on the mold box chain 1, so that the maintenance personnel can quickly replace it; after detecting that the worn rubber roller 6 has been replaced, the digital output module sends a drive signal B, and after receiving the drive signal B, the digital output module simultaneously controls the drive cylinders of the contact sensor 1 and the contact sensor 2 4 to move, so that the probes of the contact sensor 1 and the contact sensor 2 4 rise to the set height and approach the rubber rollers 6 on both sides of the mold box, and execute step 4;

[0055] As a preferred embodiment, the controller sends the position signal of each mold box, whether the rubber roller is worn, and the specific position of the worn rubber roller on the mold box chain 1 to the computer in real time, and displays them in real time through a visual interface on the computer;

[0056] Step 4: Perform the second level diagnosis; the controller collects information about whether there are empty or missing cigarettes in the cigarette group under the current operating state through the filter end sensor 7 and the tobacco end sensor 8, and determines the specific position of the empty or missing cigarettes in the cigarette group in combination with the position signal of each mold box detected by the mold box chain origin sensor 2 and the main coding signal of the 725 small box packaging machine detected by the main encoder, and adjusts the rejection operation parameters of the corresponding cigarette layer according to the specific position of the empty or missing cigarettes in the cigarette group; if the erroneous rejection phenomenon disappears, the fault is eliminated, and after the current parameters are saved, the diagnosis process ends and step 6 is executed; if the erroneous rejection phenomenon still exists, step 5 is executed;

[0057] As a preferred embodiment, the controller sends the position signal of each mold box, whether there is an empty or missing cigarette, and the specific position of the empty or missing cigarette in the cigarette group to the computer in real time, and displays it in real time through a visual interface on the computer;

[0058] Step 5: Perform the third-level diagnosis; extract the core operation parameters and analyze the parameter changes, identify the abnormal parameters that cause the false rejection and make corrections, and observe whether the equipment can operate normally. If the false rejection phenomenon is eliminated, save the current parameters, end the diagnosis process, and execute step 6; if the false rejection phenomenon still exists, repeat the observation and correction of the abnormal parameters until the parameters are adjusted to a reasonable range to eliminate the false rejection phenomenon;

[0059] As a preferred embodiment, the controller sends the abnormal parameters and the correction parameters to the computer in real time, and displays them in real time through a visual interface on the computer;

[0060] Step 6: Save the current operation parameters and exit the diagnostic system.

[0061] In order to facilitate real-time observation, in step 4, the control displays the specific position of the empty or missing cigarettes in the cigarette group in real time through the display screen connected thereto.

[0062] This method has simple steps and can efficiently and accurately detect the cause of incorrect cigarette rejection through an online detection method without affecting the normal function of the original equipment, effectively reducing the maintenance time and difficulty; at the same time, it can achieve accurate positioning of defective cigarettes and targeted troubleshooting through graded diagnosis.

Claims

1. A diagnostic device for a cigarette detection system of a high-speed packaging machine, comprising a controller, a computer, a digital input module, an analog input module and a digital output module, characterized in that: It also includes a contact sensor 1 (3), a contact sensor 2 (4), a mold box chain origin sensor (2), a filter tip end sensor (7), a tobacco end sensor and a main encoder; The contact sensor 1 (3) and the contact sensor 2 (4) are both cylinder-type digital sensors, and are symmetrically installed on both sides of the mold box chain (1) and are respectively located below the two supporting rollers on both sides of each mold box; the contact sensor 1 (3) and the contact sensor 2 (4) are respectively used to detect the degree of wear of the two corresponding supporting rollers by contact; The mold box chain origin sensor (2) is installed below the mold box chain (1) and is used to detect the position of each mold box in the mold box chain (1); The filter tip sensor (7) is three photoelectric sensors A, which are installed on the filter tip side of the cigarette group on the mold box chain (1) and are respectively arranged corresponding to the upper, middle and lower layers of cigarettes in the cigarette group, wherein the detection light of each photoelectric sensor A is irradiated on the end of the filter tip of each layer of cigarettes; The tobacco end sensors are three photoelectric sensors B, which are installed on the mold box chain (1) on one side of the tobacco end of the cigarette group and are respectively arranged corresponding to the upper, middle and lower layers of cigarettes in the cigarette group, wherein the detection light of each photoelectric sensor B is irradiated on the end of the tobacco end of each layer of cigarettes; The controller is respectively connected to the computer, the digital quantity input module, the analog quantity input module, the digital quantity output module and the 725 small box packaging machine; The digital quantity input module is respectively connected to the mold box chain origin sensor (2), the contact sensor 1 (3) and the contact sensor 2 (4); The analog input module is respectively connected to the filter tip sensor (7), the tobacco end sensor and the main encoder of the 725 small box packaging machine; The digital output module is connected to the driving cylinder of the contact sensor 1 (3) and the driving cylinder of the contact sensor 2 (4) via an electromagnetic reversing valve (5); Wherein, the device also includes a human-computer interactive touch control screen; The human-computer interaction touch control screen is connected to the controller, and a visual interface and control buttons are provided on the human-computer interaction touch control screen. The visual interface is used to display the diagnostic process parameters in real time according to the control of the controller, and the control buttons are used to send a first-level diagnostic control signal, exit a first-level diagnostic control signal, a second-level diagnostic control signal, exit a second-level diagnostic control signal, a third-level diagnostic control signal, and exit a third-level diagnostic control signal to the controller.

2. The diagnostic device of the cigarette detection system of a high-speed packaging machine according to claim 1, characterized in that: The controller is a PLC controller.

3. A diagnostic device for a cigarette detection system of a high-speed packaging machine according to claim 1 or 2, characterized in that: The electromagnetic reversing valve (5) is a two-position three-way electromagnetic reversing valve. When it works in the left position, the gas path between its P port and A port is connected, and its T port is blocked. When it works in the right position, its P port is blocked, and the gas path between its T port and A port is connected. The P port of the electromagnetic reversing valve (5) is connected to the high-pressure gas source through a pipeline.

4. A diagnostic method for a cigarette detection system of a high-speed packaging machine, characterized in that: The following steps are involved: Step 1: Control the start of the 725 small box packaging machine through the PLC controller; Step 2: Check whether there is any false rejection during the operation of the 725 small box packaging machine. If there is no false rejection, keep the 725 small box packaging machine running normally. If there is a false rejection, execute step 3; Step 3: Perform the first level diagnosis; control the running speed of the 725 small box packaging machine to be reduced to 100 packs / minute, and send a drive signal A to the digital output module. After receiving the drive signal A, the digital output module simultaneously controls the drive cylinders of the contact sensor 1 and the contact sensor 2 (4) to move, so that the probes of the contact sensor 1 (3) and the contact sensor 2 (4) are both raised to a set height and respectively approach the rubber rollers (6) on both sides of the mold box. The mold box chain (1) rotates three times as a diagnosis cycle. The wear condition of the rubber roller (6) is determined based on the displacement signals fed back by the contact sensor 1 and the contact sensor 2 (4). If there is no wear, directly execute step 4; If there is wear, the controller determines the specific position of the worn rubber roller (6) on the mold box chain (1) in combination with the position signal of each mold box detected by the mold box chain origin sensor (2) and the main encoding signal of the 725 small box packaging machine detected by the main encoder, so as to facilitate maintenance personnel to quickly replace it; after detecting that the worn rubber roller (6) has been replaced, the digital output module sends a drive signal B to the digital output module. After receiving the drive signal B, the digital output module simultaneously controls the drive cylinders of the contact sensor 1 and the contact sensor 2 (4) to move, so that the probes of the contact sensor 1 (3) and the contact sensor 2 (4) are both lowered to the set height and reset to the state of being away from the rubber rollers (6) on both sides of the mold box, and executes step 4; Step 4: Perform the second level diagnosis; the controller uses the filter tip end sensor (7) and the tobacco end sensor to collect information about whether there are any empty or missing cigarettes in the cigarette group under the current operating state, and combines the position signal of each mold box detected by the mold box chain origin sensor (2) and the main coding signal of the 725 small box packaging machine detected by the main encoder to determine the specific position of the empty or missing cigarettes in the cigarette group, and adjusts the rejection operation parameters of the corresponding cigarette layer according to the specific position of the empty or missing cigarettes in the cigarette group; if the erroneous rejection phenomenon disappears, the fault is eliminated, and after the current parameters are saved, the diagnosis process ends and step 6 is executed; if the erroneous rejection phenomenon still exists, step 5 is executed; Step 5: Perform the third-level diagnosis; extract the core operation parameters and analyze the parameter changes, identify the abnormal parameters that cause the false rejection and make corrections, and observe whether the equipment can operate normally. If the false rejection phenomenon is eliminated, save the current parameters, end the diagnosis process, and execute step 6; if the false rejection phenomenon still exists, repeat the observation and correction of the abnormal parameters until the parameters are adjusted to a reasonable range to eliminate the false rejection phenomenon; Step 6: Save the current operation parameters and exit the diagnostic system.

5. The diagnostic method of a cigarette detection system for a high-speed packaging machine according to claim 4, characterized in that: In step 4, the control performs real-time display of the specific position of the empty or missing cigarette in the cigarette group through the display screen connected thereto.

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